Selecting A Port For The Cable; Device Chain - Xilinx EZTag User Manual

EZTag User Guide
Warning: Cable protection ensures that the parallel port cannot be
damaged through normal cable operation. For increased safety,
please power up the PC before the target system is powered up.
Figure 3-1 EZTAG Cable and Leads

Selecting a Port for the Cable

You may select a serial or parallel port for your cable from the EZTag
Interface. To set up a parallel port:
To set up a serial port:

Device Chain

The device chain U1, U2, U3, ... Un is a serial chain where U1 is the
first device TDI enters and Un is the last device. Un must deliver the
TDO signal back to the cable. TMS and TCK signals enter all devices
in parallel.
When you set up the EZTAG device chain you must list the devices in
the chain in order even if they are in BYPASS mode. List every device
in the chain whether they are Xilinx devices or some other third party
device.
3-2
Attach lead's connector to first row of pins
Cable Parallel Port
Cable Serial Port
R
[ LPTn ]
[ Comn ]
Xilinx Development System
.. ..
. .
.. ..
. .
VCC
GND
TCK
TDO
TD1
TMS